Re: [Alsa-devel] Mono to stereo ?

[Jeff Muizelaar]

Takashi Iwai wrote:

At Fri, 28 Mar 2003 11:21:04 -0500,
Jeff Muizelaar wrote:
 

Takashi Iwai wrote:

   

At Thu, 27 Mar 2003 23:14:22 -0400,
Manuel Jander wrote:
     

...but, if you are doing mono playback, your sound driver has to setup
your soundcard to playback on both channels the same mono channel. The 
Vortex
driver (still not in the main branch) for example splits the mono signal 
on its internal

                    ^^ By this Manuel means the mixer internal to the 
card not internal to the driver.

mixer into 2 identical signals which are feed one into each CODEC channels.
  

       

no, please don't do that.
in the ALSA, instead of the lowlevel driver, alsa-lib (and
oss-emulation module) will do this job.
     

In this case the card (not driver) is spliting the mono signal and 
sending it to both right and left channels of the codec. Thus 
channels_min should still be 1 because the card does actually support a 
single channel
   

hmm, which driver do you mean?  from the above context, i read that
the driver needs to split the signals by itself...
 

The vortex driver. Yeah rereading it, i understand how you interpreted it.

-Jeff



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